WordPress Block Editor - Custom SVG icon using javascript filter

block-editor.js

// Result: https://radleysustaire.com/s3/d87fe5/chrome

// Enqueue this script in PHP during the action "enqueue_block_editor_assets":
// $deps = array('wp-element', 'wp-hooks');
// wp_register_script( 'rs-download-block-editor', RSD_URL . '/assets/block-editor.js', $deps );

// This filter replaces the icon of any block with the prefix "rs-downloads/" using a custom SVG icon
wp.hooks.addFilter(
	'blocks.registerBlockType',
	'rs-downloads/modify_icon',
	function(settings, name) {
		
		// Change the icon of all "RS Downloads" blocks (plugin prefix)
		if ( name.indexOf('rs-downloads/') !== 0 ) return settings;

		// Path string containing  the entire icon in one path. Also see assets/icon.svg
		const path_string = "M2.47 1.3a2 2 0 0 0-2 2v7.5c0 1.11.9 2 2 2H8.4v1.77H3.5l8.59 8.85 8.58-8.85h-4.9V12.8h5.77a2 2 0 0 0 2-2V3.3a2 2 0 0 0-2-2zm9.88 1.99c.54 0 1.02.1 1.44.28.43.2.76.47 1 .83.24.35.36.75.36 1.21h-1.8a.9.9 0 0 0-.29-.7 1.08 1.08 0 0 0-.75-.26c-.32 0-.58.07-.77.21a.65.65 0 0 0-.27.54c0 .2.1.37.3.53a4 4 0 0 0 1.09.48c.52.17.94.34 1.27.54.81.46 1.22 1.1 1.22 1.92 0 .66-.25 1.17-.74 1.55a3.3 3.3 0 0 1-2.04.56c-.6 0-1.15-.11-1.65-.33a2.52 2.52 0 0 1-1.1-.9 2.35 2.35 0 0 1-.38-1.3h1.81c0 .4.1.7.31.89.21.19.55.28 1.02.28.3 0 .53-.06.7-.2a.64.64 0 0 0 .26-.54c0-.26-.1-.46-.28-.61-.19-.15-.51-.3-.98-.46a9.43 9.43 0 0 1-1.15-.46c-.97-.47-1.46-1.13-1.46-1.96 0-.42.12-.78.36-1.1.24-.31.59-.56 1.03-.74.44-.17.94-.26 1.49-.26zm-9.74.1h2.95c.89 0 1.58.2 2.08.59.5.4.75.95.75 1.67 0 .52-.1.95-.32 1.3-.2.34-.54.62-.98.83l1.56 3.02v.07H6.7L5.4 8.23h-.97v2.64h-1.8Zm13.46 0h2.41c.66 0 1.26.15 1.79.45.52.3.94.72 1.23 1.27.3.55.45 1.16.45 1.84v.34c0 .69-.14 1.3-.43 1.85-.3.54-.7.96-1.23 1.27-.52.3-1.1.46-1.76.46h-2.46ZM4.42 4.79v2.05h1.14c.34 0 .6-.1.77-.27.17-.18.26-.43.26-.75 0-.33-.09-.58-.26-.76-.17-.19-.43-.28-.77-.28Zm13.46 0v4.7h.62c.52 0 .92-.19 1.2-.55.27-.37.41-.92.41-1.65v-.32c0-.73-.14-1.27-.41-1.64a1.43 1.43 0 0 0-1.22-.55z";

		// Create an SVG icon for the block
		// Note: If your SVG has multiple paths, replace the last arg with an array of multiple path elements.
		// Note: Also consider using wp.primitives.SVG and wp.primitives.Path instead of createElement.
		settings.icon = wp.element.createElement('svg', {}, [ wp.element.createElement('path', { key: 0, d: path_string }) ]);

		return settings;
		
	}
);

Result: